Re: Gen 4 Larger coil <assistance please>

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Finn Hammer by way of Terry Fritz <teslalist-at-qwest-dot-net>" <f-h-at-c.dk>

All!

I was thinking that it still seems like an awfull lot of caps for the
job, so here are some more thoughts.
-------------------------------------------------------------------------
MMC Calculator  Ver. 2.2   9/12/2000  Terry Fritz
Transformer voltage =  14400
Transformer current =  1
Firing voltage =  20364.62
Fo =  50000
Break rate =  1000
Thermal dissipation constant =  22
Individual cap value =  1.5E-07

Strings  Caps/Str  Capacitance  Voltage   Temp C    Cost              I
Arms
   4        9         66.67        18000    40.55   36.00  :-|   :-((
55.29
   5       11         68.18        22000    27.14   55.00  :-))  :-((
56.54
   6       13         69.23        26000    19.43   78.00  :-))  :-(
57.41
   7       15         70.00        30000    14.60  105.00  :-))  :-|
58.05
   8       17         70.59        34000    11.36  136.00  :-))  :-|
58.54
   8       18         66.67        36000    10.14  144.00  :-))  :-|
55.29
   9       19         71.05        38000     9.10  171.00  :-))  :-)
58.92
--------------------------------------------------------------------
   9       20         67.50        40000     8.21  180.00  :-))  :-)
55.98
------------------------------------------------------------------------------

As can be seen, the cap has to have much too many caps in series in
order to also have enough strings to handle the rms current. 40kV is way
overshoot.

But the geekcaps are good for a bit more than 8 amps, so perhaps it
would be allright to go for the 58/8 ~7 string version, which goes like
this:

  7       15         70.00        30000    14.60  105.00  :-))  :-|
58.05

105 caps.

Another route would be to lower the breakrate to 500, and double the
capacitor, this would also reduce the need for primary turns to a more
pretty 11 turns:

--------------------------------------------------------------------------------------
MMC Calculator  Ver. 2.2   9/12/2000  Terry Fritz
Transformer voltage =  14400
Transformer current =  1
Firing voltage =  20364.62
Fo =  50000
Break rate =  500
Thermal dissipation constant =  22
Individual cap value =  1.5E-07

Strings  Caps/Str  Capacitance  Voltage   Temp C    Cost              I
Arms
   8        9        133.33        18000    20.27   72.00  :-|   :-((
78.19
   9       10        135.00        20000    16.42   90.00  :-|   :-(
79.17
  10       11        136.36        22000    13.57  110.00  :-))  :-|
79.97
  11       12        137.50        24000    11.40  132.00  :-))  :-|
80.63
  12       13        138.46        26000     9.72  156.00  :-))  :-)
81.2
--------------------------------------------------------------------
  13       14        139.29        28000     8.38  182.00  :-))  :-)
81.68

choosing the 9/10 solution would bring this picture:

9       10        135.00        20000    16.42   90.00  :-|   :-(
79.17

Hey, this is getting close to an EMMC, good! And at 90 caps, approaching
the maneageable.

Cheers, Finn Hammer


Tesla list skriver:
 >
 > Original poster: "Finn Hammer by way of Terry Fritz 
<teslalist-at-qwest-dot-net>" <f-h-at-c.dk>
 >
 > Glenn,
 >
 > With a topload 12" by 50 inches, you are around the 50kHz mark allright.
 >
 > With a 14.4 kV polepig, you can fire the caps at 20 kV, so for a power
 > troughput of 14 kW and a breakrate of 1000 BPS, you should dispence 14
 > joule at a time, which is possible if your capacitor is 70 nF.
 >
 > Using MMC calc, set up for the Geek group caps, with a heating coeff. of
 > 22, I get 9 strings of 19 caps, for a total of 171 caps.
 >
 > You should then tune the coil at 16 turns.
 >
 > Cheers, Finn Hammer
 >